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Double Rifles, Single Shots & Combinations >> Single Shots & Combination Guns

lancaster
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Reged: 06/05/08
Posts: 9037
Loc: There's a lighthouse in the mi...

Re: French Gras ??
17/02/15 06:51 PM

your 20 gauge barrel must have an inside dimeter between 15,70 and 16,20 mm. give it to a barrelmaker and let it rifling to a 16,75mm grove diameter. than a 3" 20 ga chamber and and you have a german bore gun.

there measurments for brass and for paper cases, the upper ring is allways 16,75mm, the lower rings measure 16,05mm for paper and 16,65mm for brass cases. the 20 ga cats head bullet itself is 20 mm long.

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Post Extras

Entire topic
Subject	Posted by	Posted on
French Gras ??	John303	12/02/15 02:08 PM
Re: French Gras ??	DarylS	12/02/15 03:18 PM
Re: French Gras ??	Ash	12/02/15 11:03 PM
Re: French Gras ??	lancaster	12/02/15 11:33 PM
Re: French Gras ??	Ash	13/02/15 12:26 AM
Re: French Gras ??	John303	13/02/15 01:47 AM
Re: French Gras ??	John303	17/02/15 12:58 PM
Re: French Gras ??	lancaster	17/02/15 06:51 PM
Re: French Gras ??	John303	18/02/15 01:18 PM
Re: French Gras ??	FrankS	22/02/15 06:29 PM
Re: French Gras ??	lancaster	12/02/15 08:54 PM

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